Upon first glance at production credits,we can say TBC means there's someone missing. For example the title song has also Mike Hermosa as a producer normally; he's not listed on the producers list but there's one spot written as TBC.
Hello welcome the Let the Light In club I've been mesmerized by this phrase since the Cruel World intro lyrics. I believe this song will touch our souls and will be one of the album's best Fingers crossed!